[
https://issues.apache.org/jira/browse/HDFS-12074?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16070744#comment-16070744
]
Arpit Agarwal commented on HDFS-12074:
--------------------------------------
+1 pending Jenkins. Thanks for the backport [~vagarychen]!
> [branch-2] Add counters for block re-replication
> ------------------------------------------------
>
> Key: HDFS-12074
> URL: https://issues.apache.org/jira/browse/HDFS-12074
> Project: Hadoop HDFS
> Issue Type: Bug
> Reporter: Chen Liang
> Assignee: Chen Liang
> Attachments: HDFS-12043-branch-2.005.patch
>
>
> We occasionally see that the under-replicated block count is not going down
> quickly enough. We've made at least one fix to speed up block replications
> (HDFS-9205) but we need better insight into the current state and activity of
> the block re-replication logic. For example, we need to understand whether is
> it because re-replication is not making forward progress at all, or is it
> because new under-replicated blocks are being added faster.
> We should include additional metrics:
> # Cumulative number of blocks that were successfully replicated.
> # Cumulative number of re-replications that timed out.
> # Cumulative number of blocks that were dequeued for re-replication but not
> scheduled e.g. because they were invalid, or under-construction or
> replication was postponed.
>
> The growth rate of of the above metrics will make it clear whether block
> replication is making forward progress and if not then provide potential
> clues about why it is stalled.
--
This message was sent by Atlassian JIRA
(v6.4.14#64029)
---------------------------------------------------------------------
To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org
For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org
